<https://comfyearrings.com/shop/blue-sapphire/#product>
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"Be comfortable and stylish in ComfyEarrings. Featuring high-quality round 4.0 mm cubic zirconia stones set in 316L Surgical Grade Stainless Steel. Posts are standard width (18 gauge/1.0 mm). Length of post is 6.0 mm long, which is \"one size fits most.\" If you're ordering for small ears, please request free clear spacers in the \"order notes.\"\r\n\r\nThe exclusive screw-on Comfy flat back is just 6.0 mm wide and 2.0 mm thick for maximum comfort and balance. It eliminates pressure on your ears and covers the back of the post to protect your neck from painful pokes (even while sleeping)!\r\n\r\nComes packaged in a classic gift box.\r\n\r\nGem Color: Sapphire / Blue\r\nGem Size: 4.0 mm\r\nPost: 1.0 mm x 6.0 mm (18 gauge)\r\nMetal: 316L Surgical Grade Stainless Steel\r\nGem Type: Cubic Zirconia\r\nQuantity: Sold as a Pair of Earrings"
<https://comfyearrings.com/shop/blue-sapphire/>